What Will Grow Around a Black Walnut Tree?

Black walnut trees (Juglans nigra) are native to eastern North America and are known for their large, dark nuts. They are also known for allelopathy, the release of chemicals that can inhibit the growth of other plants. This can make it difficult to grow other plants around a black walnut tree, but there are a few that can tolerate the allelopathic effects.

Tolerant Plants

• Perennials: Hostas, ferns, bleeding hearts, daylilies, and irises
• Annuals: Impatiens, petunias, marigolds, and zinnias
• Vegetables: Tomatoes, peppers, cucumbers, and beans
• Shrubs: Viburnum, elderberry, lilac, and hydrangea
• Trees: Crabapple, hawthorn, redbud, and serviceberry

Planting Tips

When planting around a black walnut tree, it is important to:

• Choose tolerant plants. As mentioned above, not all plants can tolerate the allelopathic effects of black walnut trees.
• Plant at a distance. The allelopathic effects of black walnut trees are strongest in the soil directly beneath the tree. Planting at a distance of at least 10 feet from the trunk will help reduce the impact on other plants.
• Amend the soil. Adding compost or other organic matter to the soil can help neutralize the allelopathic effects of black walnut trees.
• Mulch around the base of the tree. Mulch can help suppress the growth of weeds and help retain moisture in the soil.

Conclusion

With careful planning and planting, it is possible to grow a variety of plants around a black walnut tree. By choosing tolerant plants, planting at a distance, and amending the soil, you can create a beautiful and thriving landscape.